CPR involves chest compressions, and sometimes mouth-to-mouth, which helps circulate blood and oxygen around the body while a person is unconscious and either not breathing on their own or breathing abnormally.

It's a skill that anyone can learn. And according to research by Monash University, patients who receive 'bystander CPR' — given by a person on the scene, who is not necessarily a health professional — are more than twice as likely to survive cardiac arrest than those who don't.

What's a defibrillator (and where are they)?

The nurse who helped Page, Grace Jones, used a public-access defibrillator (AED) located in the RSL where The Wiggles were performing. A defibrillator is a device that uses electricity to restart (or 'shock') the heart into the right rhythm.

The 'defib' analyses the heart rhythm and determines whether a shock is needed. AEDs are totally automated so they can be used by anyone, even if they haven't received training. The device will tell you what to do using voice prompts.

If a defibrillator is used within the first few minutes of cardiac arrest, a person's chance of survival is as high as 70%

Acting quickly is key: defibrillation is most effective when applied within 3 minutes of a sudden cardiac arrest. Its effectiveness is reduced by 10% for every minute that passes before defibrillation. Never be afraid to use one.

Defibrillators are often found in large public places and workplaces, such as schools, gyms, shopping centres and community centres.

How to save a life

Call triple zero (000) and ask for an ambulance if someone has had a cardiac arrest, is unconscious or unresponsive, or is not breathing.